Please be advised, there is a current issue with PAN-OS 9.1.6 which seems to break anything SMB related, e.g. mapped network drives. Sessions have an end reason of "incomplete" and go into state "aged out" in the session table.
After doing a packet capture, i found firewall dropping packets with info Negotiate Protocol request - SMB
For now I did Application Override to sort this issue.
Need to know if this has been taken care in any newer version.
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